Open-Plan Conversions Deptford
Open-plan kitchen, diner and living conversions in Deptford, steel, floors, heating and finishes as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £3,000 to £8,000+
- Free site survey, itemised quote
GS Renovation creates open-plan spaces throughout Deptford, from kitchen-diners in post-war flats and the SE8 warehouse conversions near the Creek to knock-throughs in the older houses. We open these homes up with steel sized by the structural engineer we appoint and considered detailing, keeping the character while gaining the light and flow.
In Deptford, a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Deptford: the structural engineer we appoint designs the steel, we install it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Open-plan conversion, steel beam and finishing | £3,000 to £8,000+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Open-Plan Kitchen-Diner Ideas.
How the job runs
- Free site survey at your Deptford address, covering the walls, services and floor levels, and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Lewisham Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
- Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.
Open-plan living in Deptford homes
Deptford's older houses, the Georgian and Regency townhouses and the later terraces, were built as a series of separate rooms, so opening them up means removing structure, not just a stud partition. A knock-through between the two receptions, or a rear kitchen-diner, usually crosses a load-bearing spine wall, which is why a structural engineer sizes the steel to carry the floors above before we touch anything.
Not every Deptford homeowner wants a single vast room. In these characterful SE8 houses a broken-plan layout often works better, keeping a sense of separate zones with a wide supported opening, a half-height wall or a Crittall-style glazed divider. The engineer designs the steel and we plan the finishes around it, so the new space feels intentional rather than simply gutted.
Housing in Deptford
Count the homes in Deptford and you get about 14,290: 84% built since 1945, 4% between the wars and 9% before 1919, with flats at 85% and houses at 15%. Since most homes here are flats, opening up a flat in Deptford changes its fire escape route, which building control checks.
Tell building control about the wall and the kitchen in Deptford
Where an open plan scheme in Deptford joins a kitchen to a living room, Lewisham's building control fees chart sees two pieces of work: removal of an internal wall, with 2 inspections, and installation of a new kitchen, with 3 inspections. Describe both on the application from the start. If the kitchen is left off and added later, the inspector arrives at the wall stage without knowing where the new waste and extract runs go, and a second application follows. With both on one application, we can plan the visits so the steel and the first fix pipework are seen while the ceiling is still open.
In Deptford the home being opened up is more often a flat than a house, because 85% of homes here are flats and just 1% are semi-detached or detached. In a flat, joining rooms changes more than structure. The wall that goes may be the one that kept the kitchen apart from the hall, and Lewisham's own inspectors check fire safety alongside everything else. So the layout of the joined room, including any door that becomes a glazed screen and where the smoke and heat alarms go, is drawn before the wall comes down rather than decided on site.
Steel, sign-off and clean work in SE8
The beam that makes an open-plan room possible bears onto padstones at each end and is propped while the wall below is removed in careful stages. In a tall Deptford terrace the loads coming down through the house are significant, so the engineer's calculations decide the section rather than a rule of thumb, and the bearings are detailed to spread the load into sound masonry.
Opening up a load-bearing wall is notifiable under the Building Regulations, so Lewisham building control inspects and signs off the finished work. Where the steel bears into the shared party wall with the neighbouring house, the Party Wall Act applies and you serve notice first, as building owner or through your surveyor; we give you the drawings and programme it needs. We dust-protect the home, work cleanly around the family, and hand over a signed-off, plastered space.
- Heat loss and acoustic considerations before the wall comes out
- Zoned lighting circuits and dimming for a multi-use room
- Lighting, heating and electrical reconfiguration
VOA Council Tax stock of properties, March 2025, for Deptford North, Silwood & Pepys and New Cross & Deptford South. Counts rounded by the VOA.
Why Choose GS Renovation in Deptford
Deptford clients choose GS Renovation because an open-plan conversion is a structural project that needs one accountable team. We bring the engineer's design and Lewisham building control together, seat the steel the engineer has sized, and finish neatly in an occupied home. Our founder's 30+ years on the tools means the result is open, signed off and built to last.
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
FAQ
Frequently Asked Questions about Open-Plan Conversions Deptford
What is the going rate for open-plan conversion around Deptford?
Open-plan conversion around Deptford typically costs £3,000 to £8,000 or more (indicative), but scope varies more than the market does. Two Deptford jobs of the same size can be different work, because the ceiling height decides whether the beam sits flush or drops below it. GS Renovation surveys and prices each on its merits at SE8, with the Lewisham Council building control fee shown separately.
Can I knock two rooms into one in a Deptford period house without planning permission?
Usually yes, because the dividing wall is internal. Removing it is controlled under the Building Regulations and signed off by Lewisham building control, not planning. The exception is a listed house, where listed building consent is needed for the internal work too. Planning only comes in if the job also changes the outside of a house in a conservation area. We confirm what your specific property needs before starting.
Why does opening up a Deptford flat need a fire strategy?
Knocking the kitchen into the living room can leave a cooker standing between the bedrooms and the front door, where the old corridor used to shield anyone leaving. Part B counts that as altering the way out, so Lewisham's inspector needs to accept a written approach to escape at design stage. With 85% of Deptford dwellings being flats, that conversation opens most of our open-plan jobs here.
Is making a concrete-framed Deptford apartment open plan easier?
Often, because many internal walls in these blocks are lightweight partitions rather than structure. The catch is underneath: the floor finishes in each room may sit at different heights on the slab, and with no void there is nowhere to hide pipework. The joined floor is levelled with screed or a new subfloor before the kitchen and flooring go in.
Will one large room in my Deptford flat be noisier and harder to heat?
It can be both. With the dividing wall gone, clatter from the hob reaches the sofa, and on a Deptford slab a hard floor passes footfall to the flat underneath, so resilient underlay goes on the list early. The radiator on the old wall needs a new home, and heat demand for the joined room is reworked before pipes vanish into plaster.
Is a partial opening better than full open plan in a Deptford lower-ground kitchen?
In the lower-ground kitchens of the older Deptford townhouses, often yes. Head height is limited, and a full-width opening needs a deeper beam that eats into it. Keeping short nibs of wall at each end shortens the span, which can reduce the beam size and keep more ceiling height, while still joining the kitchen to the room beside it.
Is opening up a house in a Deptford conservation area a planning matter?
Not for the internal work in an unlisted house. Deptford's conservation areas include Deptford High Street and St Paul's Church, designated in 1976 and 1975, and Deptford Town Hall, designated in 2000. Designation controls the outside of buildings, so taking out an internal wall in an unlisted house there is a building control matter. The exterior is different for a flat or subdivided house, which Lewisham says has no permitted development rights there, so new rear doors need planning permission. A listed house needs consent for the internal work too.
Can a Deptford maisonette be opened up between its two floors?
It can, but cutting a larger stair opening or removing part of the floor means cutting joists, and Lewisham says building control approval is needed for the removal or partial removal of joists and beams. The structural engineer we appoint designs trimmers around the new opening. In Deptford, where 85% of homes are flats, a maisonette usually sits over or under another home, so the fire separation to that home and the escape route from the upper floor are both part of the design.
Is a Deptford flat from the 2000s simpler to open up than a post-war one?
Structurally it can be, since its inner walls may be lightweight, but fire is the bigger question. In Deptford 84% of homes were built after 1945 and 40% in 2000 or later. A newer block was designed to a fire strategy that assumed your internal walls and doors stay where they are. Ask the managing agent for that document before a layout is drawn. It shows whether your flat relies on a protected hall, and it tells the structural engineer we appoint and the inspector what the joined room has to achieve.
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